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Cummins/Onan EH41D Engine

The Cummins/Onan EH41D is a 0.4 L forced air-cooled engine, producing up to 7.3 kW. It powers generator sets from Cummins/Onan, including the PX7500.

Also known as: Cummins Onan EH41D

0.404 L
Displacement
7 kW
Gross power
On this pageSpecsGenerator setsMaintenanceFAQ

Engine specifications

Displacement0.404 L
AspirationForced air-cooled
Gross power7 kW

Common problems

3
  • When No Electricity Is Generated at Receptacle
    Fix: Check if AC circuit breaker is in the "ON" position. Check AC receptacle and DC terminals for loose connection. Check to see if engine starting was attempted with appliances already connected to generator.
  • When Engine Fails to Start
    Fix: Check if choke lever is in its proper position. Check if fuel cock is open. Check fuel level. Check to make sure generator is not connected to an appliance. Check spark plug for loose spark plug cap. Check spark plug for contamination. Check if engine switch is in OFF. Set the choke lever to "CLOSE" position. If closed, open fuel cock. If empty, refill fuel tank making sure not to overfill. If connected, turn off the power switch on the connected appliance and unplug. If loose, push spark plug cap back into place. Remove spark plug and clean electrode. Turn engine switch to ON.
  • Low power
    Fix: Carbon brushes are excessively worn

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan EH41D.

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filter—50 hr
Fuel filter—
Oil filter—
Battery—
Belt—
Coolant—
Oil4-stroke automotive detergent oil of API service class SE or higher grade (SG, SH or SJ is recommended). SAE 10W-30 or 10W-40 is recommended for general, all-temperature use.1.3 Quart—100 hr
Spark plug—500 hr

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Common questions

What is the displacement of the Cummins/Onan EH41D?

The Cummins/Onan EH41D has a displacement of 0.404 liters.

Which generators use the Cummins/Onan EH41D engine?

The Cummins/Onan EH41D powers 1 generator set(s), including Cummins/Onan PX7500.

How often should you change the oil in the Cummins/Onan EH41D?

The Cummins/Onan EH41D oil change interval is every 100 hours.

What is a common problem with the Cummins/Onan EH41D engine?

A commonly reported issue on generators using the Cummins/Onan EH41D is: When No Electricity Is Generated at Receptacle. Fix: Check if AC circuit breaker is in the "ON" position. Check AC receptacle and DC terminals for loose connection. Check to see if engine starting was attempted with appliances already connected to generator..